1-3 July, 1863.
Perhaps the climactic battle of the Civil War, although the war would continue for almost two years. Gettysburg marked the last offensive action by the Confederate Army, the failed attack on Cemetery Ridge has since been known as “The High Water Mark of the Confederacy” as it marked the furthest incursion into Union territory.
For the rest of the bloody war, the Confederate troops would be on the defensive.
Sadly, the battle gets little notoriety now, as does the Civil War in general.